Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
thi hang » thi hanh, thi nang, thi hong
hieu van » hieu va, thien van, lieu va
tu sach » thu sach, su sach, te sach
van cau » van dau, van hau, van chat
cau xuc » cam xuc, cau luc, cau truc
cua tre » cua te, cuu tre, cua triet
vi cua » vai cua, di cua

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ((thi hang) or (ty xang)) xa hoi. hieu van cau xuc ((ban thanh) or (van ban)) vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((thi hang) OR (ty xang)) xa hoi. hieu van cau xuc ((ban thanh) OR (van ban)) vi cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sach ((thi hang) or (ty xang)) xa hoi. hieu van cau xuc ((ban thanh) or (van ban)) vi cua tre*.